This electronic boost controller unit?contains control unit, mounting bracket, solenoid valve, mounting screws, power harness, channel 1 and 2 harness, turbo timer harness, vaccum tube, Y fitting and filter. ?Also, there is an 58-page instruction booklet. This unit features multiple mounting options and can be mounted in either a surface mount or overhead mounting style with the supplied bracket and hardware. The unit can be titled to an angle of 20 degrees. The top mount option allows you to install the unit in a hanging orientation. This option is great for mounting the unit to the roof, under dash overhangs, or in dash pockets, while the bottom mount option allows you to install the unit on the dash, gauge panel/steering column, or in dash pockets. Since this unit contains a Boost Controller, Turbo Timer, and Switching device, each must be wired separately. This allows you to employ the features you wish to use, and ignore the ones you do not want to utilize. ? Installation Warnings: ? -This unit should only be installed by a professional installer. - Do not use this product for any purposes other than its original intent. - This unit is designed for use in 12v applications only. ?Do not use in 24v applications. - Please read the installation instructions before attempting to install or operate the unit. - The unit is a very powerful unit, and failure to follow all precautions may result in catastrophic engine failure or bodily injury. - Disconnect the Battery prior to installation. - Do not adjust the unit while driving. - Obey all laws, rules and regulations of the highway.